# Is ACoS the Same as ROAS? (No, Here is the Difference) > ACoS and ROAS are NOT the same — they are inverse metrics. Learn exactly how ACoS differs from ROAS with formulas, conversion examples, and a simple cheat sheet. Amazon Advertising Metrics # Is ACoS the Same as ROAS? (No, Here is the Difference) By VEONIB Team • Updated July 4, 2026 • 5 min read **Quick Answer:** **No, ACoS and ROAS are NOT the same.** They are inverse metrics that look at the exact same campaign data from opposite directions. **ACoS** = Cost perspective: “What percentage of revenue goes to ads?” Lower is better. **ROAS** = Return perspective: “How much revenue does each ad dollar generate?” Higher is better. **Conversion:** 20% ACoS = 5.0 ROAS • 25% ACoS = 4.0 ROAS • 33% ACoS = 3.0 ROAS A quick internet search reveals dozens of forum threads where Amazon sellers ask: _“Is ACoS the same as ROAS?”_ The confusion is understandable — both metrics use the same two inputs (ad spend and revenue), and both are used to evaluate campaign performance. This guide settles the question once and for all with clear formulas, examples, and a conversion cheat sheet you can reference anytime. ## 1\. Quick Answer: No, They Are Inversely Related ACoS (Advertising Cost of Sale) and ROAS (Return on Ad Spend) are mathematically inverse to each other. Here is the simplest possible explanation: Metric Formula What It Tells You Direction **ACoS** (Spend ÷ Revenue) × 100 Cost as a % of revenue Lower is better **ROAS** Revenue ÷ Spend Revenue per $1 spent Higher is better Think of them as a fraction flipped upside down. ACoS puts spend on top (numerator) and revenue on the bottom (denominator). ROAS puts revenue on top and spend on the bottom. This reciprocal relationship means **they move in opposite directions**: when ACoS goes down, ROAS goes up, and vice versa. ACoS = 1 ÷ ROAS   |   ROAS = 1 ÷ (ACoS as decimal) Or more practically: if you know one, you can instantly find the other. This is covered in detail in our post: [How is ACoS different from ROAS?](/how-is-acos-different-from-roas.html) ## 2\. ACoS = Spend/Revenue × 100 Let’s examine ACoS more closely. The formula is: ACoS = (Total Ad Spend ÷ Total Attributed Revenue) × 100 Because the result is multiplied by 100, ACoS is expressed as a **percentage**. This makes it intuitive for cost-budgeting: “Our ACoS is 20%, so we spend 20 cents in ads for every dollar of revenue we bring in.” ### ACoS Example - You run a Sponsored Brands campaign for a kitchen gadget. - Total Spend: $200 - Total Revenue: $800 - Calculation: ($200 ÷ $800) × 100 = **25% ACoS** This means 25% of your revenue is consumed by ad costs. Whether that is healthy depends on your profit margin. A product with a 40% margin is profitable at 25% ACoS. A product with a 20% margin is losing money. For a complete walkthrough of this calculation, see [How to Calculate ACOS on Amazon](/how-do-you-calculate-acos-on-amazon.html). ## 3\. ROAS = Revenue/Spend ROAS flips the fraction and drops the percentage conversion: ROAS = Total Attributed Revenue ÷ Total Ad Spend ROAS is expressed as a **ratio or multiple**: 4.0x (or 4:1) means you earn $4 for every $1 you spend. ### ROAS Example - Same campaign as above: $200 spend, $800 revenue. - Calculation: $800 ÷ $200 = **4.0 ROAS** Notice that 25% ACoS and 4.0 ROAS describe the exact same campaign, just from different angles. ACoS says “you spend 25 cents per dollar earned,” while ROAS says “you earn $4 per dollar spent.” Both are correct; they just emphasize different aspects of performance. ## 4\. Conversion Examples Here are common conversions that bridge the gap between the two metrics: Campaign Data ACoS ROAS $50 spend, $1,000 revenue 5% 20.0 (20:1) $100 spend, $1,000 revenue 10% 10.0 (10:1) $200 spend, $1,000 revenue 20% 5.0 (5:1) $250 spend, $1,000 revenue 25% 4.0 (4:1) $333 spend, $1,000 revenue 33.3% 3.0 (3:1) $500 spend, $1,000 revenue 50% 2.0 (2:1) For a complete conversion cheat sheet, including the specific question of what ROAS corresponds to a 25% ACoS, check our dedicated guide: [What ROAS is 25% ACoS?](/what-roas-is-25-percent-acos.html) ## 5\. Frequently Asked Questions ### Is ACoS the same as ROAS? No. ACoS = Spend ÷ Revenue × 100 (percentage of revenue spent on ads). ROAS = Revenue ÷ Spend (revenue per dollar spent). They are inverse metrics. ### How do you calculate ACoS? (Total Ad Spend ÷ Total Revenue from Ads) × 100. Example: $100 spend on $500 revenue = 20% ACoS. ### How do you calculate ROAS? Total Revenue from Ads ÷ Total Ad Spend. Example: $500 revenue on $100 spend = 5.0 ROAS (5:1). ### What is 25% ACoS in ROAS? 25% ACoS = 4.0 ROAS. Formula: ROAS = 1 ÷ 0.25 = 4.0. You earn $4 per ad dollar spent. ### Why do people confuse ACoS and ROAS? Because both use the same two numbers (spend and revenue) but apply opposite formulas. They describe the same campaign from different perspectives, leading many sellers to assume they mean the same thing. ### Make Your Products Stand Out with AI-Generated Video VEONIB turns any product URL into a stunning e-commerce video in 60 seconds. Showcase your Amazon products with professional video content that boosts conversion rates. No editing experience needed. [Try VEONIB Free →](https://veonib.com) ### Related Guides [How to Calculate ACOS on Amazon](/how-do-you-calculate-acos-on-amazon.html) [How is ACOS different from ROAS?](/how-is-acos-different-from-roas.html) [What ROAS is 25% ACOS?](/what-roas-is-25-percent-acos.html)